Look, the trees are fallen; there ______ a strong wind last night.

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问题 Look, the trees are fallen; there ______ a strong wind last night.

选项 A、must be
B、should have been
C、must have been
D、could be

答案C

解析 看,树倒了,昨晚一定是刮大风了。本题后半句用的是there be句型,是对过去发生的事情的肯定推测,要用must have+过去分词的形式。
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